MAINT Use list and dict comprehension

[rth]

This uses list and dict comprehension in places where it doesn't hurt readability. It should be a bit faster and less verbose.

[datapythonista]

Nice fixes, thanks for taking care of them.

Just added a comment that IMO would improve readability, but lgtm.

[datapythonista]

personally I think it'd be a bit more readable like:

r = [pprint_thing(next(s),
                  _nest_lvl + 1,
...

[codecov]

Codecov Report

Merging #23894 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #23894      +/-   ##
==========================================
- Coverage   92.31%    92.3%   -0.01%     
==========================================
  Files         161      161              
  Lines       51471    51431      -40     
==========================================
- Hits        47515    47475      -40     
  Misses       3956     3956

Flag	Coverage Δ
#multiple	90.7% <100%> (-0.01%)	⬇️
#single	42.44% <35.29%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/groupby/ops.py	96.77% <100%> (-0.03%)	⬇️
pandas/plotting/_core.py	83.58% <100%> (-0.05%)	⬇️
pandas/core/config.py	87.04% <100%> (-0.13%)	⬇️
pandas/core/dtypes/concat.py	96.63% <100%> (-0.04%)	⬇️
pandas/core/computation/align.py	97.84% <100%> (-0.05%)	⬇️
pandas/core/sparse/frame.py	94.83% <100%> (-0.03%)	⬇️
pandas/io/formats/style.py	96.67% <100%> (-0.03%)	⬇️
pandas/core/internals/blocks.py	93.69% <100%> (-0.02%)	⬇️
pandas/core/panel.py	97.91% <100%> (-0.02%)	⬇️
pandas/io/formats/printing.py	93.01% <100%> (-0.08%)	⬇️
... and 4 more

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[jreback]

can you merge master, ping on green.

[pep8speaks]

Hello @rth! Thanks for updating the PR.

• There are no PEP8 issues in the file pandas/core/computation/align.py !

• There are no PEP8 issues in the file pandas/core/config.py !

• There are no PEP8 issues in the file pandas/core/dtypes/concat.py !

• There are no PEP8 issues in the file pandas/core/frame.py !

• There are no PEP8 issues in the file pandas/core/groupby/ops.py !

• There are no PEP8 issues in the file pandas/core/internals/blocks.py !

• There are no PEP8 issues in the file pandas/core/panel.py !

• There are no PEP8 issues in the file pandas/core/reshape/melt.py !

• There are no PEP8 issues in the file pandas/core/sparse/frame.py !

• There are no PEP8 issues in the file pandas/core/window.py !

• There are no PEP8 issues in the file pandas/io/excel.py !

• There are no PEP8 issues in the file pandas/io/formats/html.py !

• There are no PEP8 issues in the file pandas/io/formats/printing.py !

• There are no PEP8 issues in the file pandas/io/formats/style.py !

• There are no PEP8 issues in the file pandas/io/sas/sas_xport.py !

• There are no PEP8 issues in the file pandas/io/stata.py !

• There are no PEP8 issues in the file pandas/plotting/_core.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_axis_select_reindex.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_indexing.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_replace.py !

• There are no PEP8 issues in the file pandas/tests/generic/test_generic.py !

• There are no PEP8 issues in the file pandas/tests/groupby/aggregate/test_cython.py !

• There are no PEP8 issues in the file pandas/tests/groupby/test_groupby.py !

• There are no PEP8 issues in the file pandas/tests/groupby/test_grouping.py !

• There are no PEP8 issues in the file pandas/tests/groupby/test_rank.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_constructor.py !

• There are no PEP8 issues in the file pandas/tests/sparse/frame/test_frame.py !

• There are no PEP8 issues in the file pandas/tests/sparse/series/test_series.py !

• There are no PEP8 issues in the file pandas/tests/test_resample.py !

[rth]

Thanks @datapythonista ! Addressed your comment.

@jreback Merged master in and CI is green.

[jreback]

thanks @rth